B1750

DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1735 01
- Driver Seat Front Up Switch Circuit Short to Battery

DTC B1740 01
- Driver Seat Front Down Switch Circuit Short to Battery

DTC B1745 01
- Driver Seat Rear Up Switch Circuit Short to Battery

DTC B1750 01
- Driver Seat Rear Down Switch Circuit Short to Battery

DTC B1755 01
- Driver Seat Assembly Horizontal Forward Switch Circuit Short to Battery

DTC B1760 01
- Driver Seat Assembly Horizontal Rearward Switch Circuit Short to Battery

DTC B1815 01
- Driver Seat Recline Forward Switch Circuit Short to Battery

DTC B1820 01
- Driver Seat Recline Rearward Switch Circuit Short to Battery

Diagnostic Fault Information






Circuit Description

When the power seat switches are pressed, they send a 12-volt signal through the switch signal circuits to the memory seat module (MSM). The MSM then commands the driver seat motors to move in response to the switch signals.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

* If a seat switch circuit is active in one direction and the switch for the opposite direction is pressed, this DTC will set.
* A short to voltage on a switch signal circuit.

Action Taken When the DTC Sets

* A motor output driven in response to a switch considered failed, is deactivated for both directions.
* All memory recall commands are ignored.
* The MSM will respond to any other switch signal that has not set a DTC.

Conditions for Clearing the DTC

* The current DTC will clear and set the code to history, 3 seconds after the fault is no longer present and the ignition is cycled OFF then back to ACC or RUN.
* A history DTC will clear after 50 ignition cycles.

Circuit/System Verification

Ignition ON, observe the scan tool seat switch parameters while pressing the appropriate seat directional switches. The reading should change between Inactive and Active.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.
2. Verify the scan tool seat switch parameters listed below are Inactive.

* Front Vertical Upward Switch
* Front Vertical Downward Switch
* Rear Vertical Upward Switch
* Rear Vertical Downward Switch
* Horizontal Forward Switch
* Horizontal Rearward Switch
* Recline Forward Switch
* Recline Rearward Switch

^ If not INACTIVE, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.

3. If all circuits test normal, test or replace the seat adjuster switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Power Seat Switch Replacement